Tuesday, November 9, 2010

Color code

To enable wires to be easily and safely identified all common wiring safety codes mandate a colour scheme for the insulation on power conductors. Many local rules and exceptions exist. Older installations vary in colour codes, and colours may shift with heat and age of insulation.
Standard wire colours for flexible cable
Such as Extension cords, power (line) cords and lamp cords
World Region, country
or other entity(ies)
Hot (Live) Neutral Protective earth/ground
EU, Australia & South Africa (IEC 60446) brown blue green & yellow
Australia & New Zealand (AS/NZS 3000:2007 3.8.1) brown light blue green/yellow
United States and Canada black (brass) white (silver) green (green)
Standard wire colours for fixed cable
(In or behind the wall wiring cables)
Region Phases Neutral Protective earth/ground
EU (IEC 60446) including UK from 31 March 2004 brown, black, grey blue green & yellow
Australia and South Africa red black green & yellow (core is usually bare and should be sleeved at terminations. In Australia the earth core has been separately insulated with green or green/yellow plastic since about 1980.
United States and Canada 120/208/240V: black, red, blue (brass)
277/480V: brown, orange, yellow
120/208/240V: white (silver)
277/480V: grey
green (green)
or bare copper wire
Isolated ground: Green with yellow stripe
Note: the colours in this table represent the most common and preferred standard colours for single phase wiring however others may be in use, especially in older installations.

1 comment:

  1. How the ground wiring works in plastic boxes. and All about electrical wire.Electrical Wiring